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P. E. HERDMAN.' ELECTRIC ELEVATOR.

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F. E. HBRDMAN. ELECTRIC ELBVATOR Patented Peb. 21, 1893.

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l ELECTRIC ELBVATOR. Nol 492,160. Patented Feb. 21, 1893.

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Unirse STATES PATENT @Erica FRANK E. I-IERDMAN, OF INDIANAPOLIS,INDIANA.

ELECTRIC ELEVATOR.

SPECIFICATIONformng part of Letters Patent No. 492,160, dated February21, 1893.

Application tiled March 8, 1892. Serial No. 424,140. (No model.)

To @ZZ whom t may concern:

Be it known that I, FRANK E. HEnDMAN, a citizen of the United States,residing at Indianapolis, county of Marion, and State of Indiana, haveinvented a new and useful Improvement in Elevators, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, which form a part of this specification.

My improvement has especial application to those elevators the power forlifting which is electricity, and to that class of elevators where theelectricity is conveyed to the motor through resistances, and has forone of its objects mechanism to cause the brush to travel over` theresistances, and has, for another object, mechanism to cause the braketo be automatically put in action when the current is cut off and to bemoved out of action when the current is admitted.

In the drawings-Figure l is a side elevation, partially in section ofoperating mechanism. Figs. 2 and 3 are sectional views of the valve indifferent positions. Fig. t is a side elevation partially in section ofoperating mechanism, with modied form of device. Fig. 5 is a detail viewof modified form of operating device. Fig. 6 is an enlarged detail viewof switch and electric devices and motor of Fig. l. Fig. 7 is anenlarged detail view of switch and electric devices and motor of Fie. 4.Fig. S. is a plan view of Fig. l.

A is the worm casing containing the worm and worm gear A.

A2 is the worm shaft and a the yoke.

E is the armature, whose shaft is coupled directly with the worm shaftA2 by the coupling G, which has its rim extended into the form of abrake-wheel H, on whose surface acts an ordinary friction-brake, helddown by a weight J. On the top of the motor is placed the resistance boxQ.

K is a snap switch, having brushes 7c, 7c.

O is the drum, o its shaft. On the end of this drum-shaft is a longscrew c, shown in plan. On this screw is placed the nut p,

which is connected in a slot in the connecting rod R, so that said nutcannot revolve, but so that the connecting rod Ris adapted to have amotion to-and-fro on the same. n On each. side of the nut, and fastenedto the connecting rod R, are the fingers s, s, one on one side and oneon the other. The shoulder where the screw connects with the drum-shaftis madein a spiral T, of the same longitudinal pitch as the pitch of thescrew, but so that anything riding on it will be carried to the outersurface of the shoulder. To the other end of the screw o is clamped anut, with a similar spiral shoulder T, so that it can be placed at anydesired distance from the shoulder T.

The connecting rod R is connected by the lever R to the switch K. If theswitch is thrown upward, the connecting rod R would necessarily bethrown to the left, which would carry the finger s on the inside, to theleft. Vith the switch thrown in this direction, the drum would move inthe direction of the arrow, as shown in Fig. l, which would necessarilycause the revolving of the screw o', and the throwing of the nut P inthe direction of the drumshaft, when the nut carries the connecting rodR in that direction, so that the linger s rides on the spiral T, and itis pushed back, moving the connecting rod to the right and throwing theswitch to the center and cutting the current off. of the elevator,thereby stopping it. If the switch K is thrown in the oppositedirection, or downward, the drum moves in the direction opposite to thearrow, and the nut P travels in the direction opposite to that beforedescribed, on the screw, and comes in contact with the spiral T, clampedon the outer end of the screw 0. lVhen the finger s reaches the spiral,it causes the connecting rod to move in the direction opposite to thatbefore described, again bringing the switch to the center, and cuttingthe current off. This described arrangement forms an automatic stop, sothat the elevator is automatically stopped, independently of theoperator, at the end of its the spring R3. Yis alever in the car, havinga brush g/ connected with it. This lever is in electrical connectionwith one of the poles of the current supply, and the other pole of thebattery is connected by a loop circuit with both of the electro-magnetslV and V. 3 and i are two contact points having electrical connectionrespectively with the magnets W and W. When the lever is moved incontact with the contact point 3, so that the current passes from thesource ot current supply through the contact point 3 to the magnet V,said magnet is energized and draws the core upward, drawing with it theconnecting arm U and bringing the switch in contact with the contactpoints 13 and 1st. When the lever is moved in the reverse direction, sothat it will be in contact with contact point i, the electro-magn et Iis energized, drawing down the arm U and bringing the switch in Contactwith contact points 12 and 13. 12 and 1st are two contact points inelectrical connection with the negative pole of the battery, and 13 is acontact point in electrical connection with the positive pole of thebattery. The positive pole ot' the battery is in direct electricalconnection with the field of the motor; the brush 7e' is in electricalconnection with the solenoid 1G and with the brush 2O on the arm 13. 15are the resistances; 17 a contact in electrical connection with thearmature; 2l a brush on the arm 13,111 connection with the negative poleof the battery and 22 a contact in electrical connection with the lieldof the motor and 23 is a dash pot connected to the arm 13. The brush Lis in electrical connection with the armature of the motor and with thesolenoid 10. 25 is the solenoid core. 30 is a cylinder having the piston31. 32 is a supply-pipe for said cylinder. is a valve on said pipe ope'ated by the lever 3i. 35 is a rod connected to the lever 3i.

In Figs. 1 and i, the rod 35 is connected to the core l5 of the solenoid1G, and in Fig. 5 the rod 35 is connected to the lever R; so that,ineither ease, it the switch be operated, the valve is operated. In thefirst case, the solenoid is rendered active, which lifts the rod 35,opening the valve; and in the second case, operating the switch itselfoperates the valve. In either case, operating the valve admits theliquid which moves the piston.

In Fig. 1, the piston is connected directly to the brake-weight, so thatwhen the switch operates, the weight is relieved from the brake,releasing the brake; and when the supply liquid is shut off, the pistonfalls, bringing the weight again into action and putting on the brake.

In Fig. 1, the piston not only operates the brake, but also operates thelever 1S, carrying the brush 2O so that it travels over the resist`ances 15. In this casethe weight is connected to the lever 36, pivotedat 37, which in turn is connected to the rod 195 so that when the pistonis rendered active, the brake is released and the arm 1S carried overthe resistances. In the case such as is illustrated in Fig. 5, thesolenoid may be dispensed with entirely.

I do not intend to limit myself to any specific method ot operating theswitch, nor to any specitic character of switch.

Having now fully described my invention, what I claim, and desire toprotect by Letters Patent, is*

1. In combination with an electric motor, an electric motor controllingswitch, a brake wheel, a brake upon said wheel, acylinder, a piston insaid cylinder, a supply pipe to said cylinder, a valve on said pipe andintermediate connection between said valve and the switch andintermediate connection between said piston and the brake.

2. In combination with an electric motor, a source of current supply, aresistance intcrposed between armature of said motor and source ofcurrent supply, a lever carrying a brush and adapted to travel over saidresistance, an electric motor controlling switch, a cylinder a piston insaid cylinder a supply pipe to said cylinder, a valve on said pipe, andintermediate connection between said switch and said valve, andintermediate connection between said piston and the said lever.

3. In combination with an electric motor, a source of current supply, asolenoid, an electric motor controlling switch, electrical connectionbetween said source of current supply and said switch and electricalconnection between said switch and said solenoid, a brake wheel, abralre npon said wheel, a cylinder a piston, in said cylinder connectionbetween said piston and said brake, asupply pipe for said cylinder, avalve on said pipe, and connection between said valve and the solenoidcore.

4. In combination with an electric motor, a source ot' current supply, aresistance interposed between said source of current supply and thearmature of motor, a lever carrying a brush and adapted to travel oversaid resistance, a solenoid, an electric motor controlling switch,electric connection between said switch and the solenoid, a cylinder apiston in said cylinder, connection between said piston and said lever,a supply pipe for said cylinder, a valve on said pipe, and connec tionbetween said valve and the solenoid core.

5. In combination with an electric motor, a source of current supply,rcsistances inter` posed between said motor and the source of currentsupply, a lever carrying a brush and adapted to travel over saidresistance, an electric motor controlling switch, a brake wheel, a brakeon said wheel a cylinder, a piston in said cylinder, connection betweensaid piston and br V1re and between said piston and lever, a supply pipefor said cylinder, a valve on said pipe and connection between saidvalve and said switch.

G. In combination with an electric motor, a source of current supply, asolenoid, an elec- IOO IIO

trie motor controlling switch, electrical oonneotion between seid switchand solenoid, resisianoes interposed between the source of eurreniJsupply and the armature of the n10- toi', a lever ezulying a brush andadapted to travel over seid resistanoes, a brake wheel, a brake on seidwheel, a cylinder, a piston in said cylinder, connection between saidpiston and said brake, and connection between seid piston and saidlever, e supply pipe for seid m cylinder, a Valve on seid pipe,anclconnection between seid valve and the solenoid eoi-e. In testimony ofwhich invention I have hereunto set my hand.

FRANK E. HERDMAN., Witnesses:

W. L. ROBINSON, G. E. SOHMITULAND.

